I would first look for a vet that advertises as being experienced with animals other than cats and dogs. In Ontario, where I am, these vets typically advertise as taking 'exotics.' Not that guinea pigs are necessarily all that exotic, but it generally means that the vet in question don't just do dogs and cats, but have experience with birds, lizards, rodents, etc. I would call up those vets and ask them in general, how much experience do they have with guinea pigs specifically. I also tend to want to know how much experience they have with rabbits, because in my are rabbits are more likely to be taken to the vet than guinea pigs, but have similar needs as far as dental care/abscess care, which seem to be pretty common issues. I would narrow it down to a couple possibles and take one of the pigs to a well visit so you can ask more specific questions, like what antibiotics they prescribe for pigs, whether they have experience with dental issues, whether they perform small animal surgeries, etc. Hopefully you can find someone reasonably close who has specific guinea pig experience. I also agree with Wiebke... in the event of something big, it might be worth going to see one of the really experienced vets who have performed that op or treated that problem before, but in the event of a URI or UTI or something where antibiotics are needed, having a working relationship with someone local is a great thing- and hopefully you can luck out and find someone convenient who is a pro with pigs as well!
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